Earlier quoted context omitted.
Professional comedians are…. Well known to have issues. It’s not a type of direction someone takes if they’re able to get what they need from a normal life. Just being funny != being a professional comedian.
What about someone who starts acting classes as a kid and naturally turns toward comedy? Then again I understand that being compelled to trigger something in someone all the time (laughter) can be pretty demanding. That's also an internal work of the mind and how to deal with one's thoughts and emotions, it doesn't have to be so stressful.
Do you have any examples of anyone who has done so long term?
Looking at the list of professional comedians, I'm not seeing any obvious examples.